Performance study for supercritical carbon dioxide Brayton cycle with two-stage compression

江嘉慧; 于泳强; 赵远扬

doi:10.19666/j.rlfd.202411219

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Performance study for supercritical carbon dioxide Brayton cycle with two-stage compression

Thermal Power Generation Vol. 54, Issue 9, Pages: 110-117(2025)

更新时间：2026-08-11

- Performance study for supercritical carbon dioxide Brayton cycle with two-stage compression
- 作者机构：
  
  青岛科技大学机电工程学院
- 作者简介：
- 基金信息：
- DOI：10.19666/j.rlfd.202411219
  CLC： TK12
- Published：2025
- 稿件说明：
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[1]江嘉慧,于泳强,赵远扬.两级压缩超临界二氧化碳布雷顿循环系统性能分析[J],2025,54(09):110-117.
[1]江嘉慧,于泳强,赵远扬.两级压缩超临界二氧化碳布雷顿循环系统性能分析[J],2025,54(09):110-117. DOI： 10.19666/j.rlfd.202411219.

DOI：10.19666/j.rlfd.202411219.

摘要

针对具有两级压缩中间冷却过程的超临界二氧化碳(supercritical carbon dioxide

S-CO2)布雷顿循环，构建了2种不同布局的系统模型，探究低压级压比、分流比等关键参数对系统性能的影响。结果表明：在设计工况下，再压缩循环、主压缩机两级压缩循环和再压缩机两级压缩循环均存在最小分流比和最佳分流比，且在一定分流比范围内，主压缩机两级压缩循环的热效率高于另2个循环；当3种系统均取最佳分流比时，主压缩机两级压缩循环最大热效率可达50.95%，比常规再压缩循环和再压缩机两级压缩循环分别提升了3.20%、3.98%；在不同低压级压比下，主压缩机两级压缩循环和再压缩机两级压缩循环均存在一个最佳分流比，使系统热效率达到最大，且最大热效率随低压级压比增大而降低。

Abstract

For a supercritical carbon dioxide(S-CO2) recompression Brayton(RB) system with two-stage compression and intercooling process

two system models with different layouts are constructed. The effects of key parameters such as low-pressure stage pressure ratio and split ratio on the system performance are explored. The results indicate that

the minimum and optimum splitting ratios exist for the RB cycle

the two-stage compression cycle of the main compressor(TCIP-RB)

and the two-stage compression cycle of the recompressor(RTCIP-RB)under the design conditions. Moreover

the thermal efficiency of the TCIP-RB cycle is higher than that of the other two cycles within a certain range of split ratios. When the above three systems adopt the optimal split ratios

the maximum efficiency of the TCIP-RB cycle is 50.95%

which surpasses that of the RB and RTCIP-RB cycle by 3.20% and 3.98%

respectively. At different low-pressure stage pressure ratios

TCIP-RB and RTCIP-RB cycles have an optimal split ratio to maximize the thermal efficiency of the system

and the maximum thermal efficiency decreases with the increase of the low-pressure stage pressure ratio.

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references

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